Circuit-connector



Lea-Mir.

Tool-[whom it may concern." I

Be it known that I, HARRYA. DOUGLAS,

a citizen of the United States residing at 7 Bronson, in the county ofBranch and State of Michigan, have invented a certain new and'usefulImprovement in Circuit-Connec-I tors, of which the following is a'full,clear, concise, andexact description.

Myinvention relates to the formation of tubular shells and also to theassembly of shells with contact'carrying cores or other cores and armsorlugs.

The invention has for one of its objects animproved formation of a shellfrom a sheet of metal or other suitable material wherein opposite edgesof the metal sheet erly curled to form a shell. The mortises and tenonsare desirably "of T-shape, the in-@ terengagin'g inner edges of thetenons preventing the shell from being expanded and i the outer edgesofthe tenons, by engaging [the base edges of the mortises, preventingthe shell from being" contracted. p p

In accordance with another object of my invention a shell, Whether it isconstructed as above set'forth orotherwise, has an outer. bulgingportion along and within which an arm extends. This bulging portion ofthe shell permits a contact carrying core that conforms in crosssectionto the bore of the shell to be placed within the shell in the same zonewith the 'arm that is received in the bulging portion of the shell,while allowing such arm to be confined between the contact carrying coreand the metalo'f the shell. The shell also desirably carries a lugspaced apart from the aforesaid bulging.

portion of. the shell and which cooperates with the bulging portion ofthe shell, and preferably also the contact carrying core, to hold thearm and shell inassembly withp out the aid of a fastening screw.This'arm has a continuation that extends tothe ex= terior of the shellthrough an opening-progrnounr-coivnnomon.

by reference to the oi the sheet;

To nouGLAs & Rum) MFG.

or .ivrronrean;

Application 'filed October 24, 1917. Serial 195,339.

videdthrough a side ofthe 511611, This n s art rm rrita rIARnY A:toetisjeamasou, Ia ciriean. essrenoia I 00.,015 BRONSON, MICHIGAN, ACORPORATION Specification of Letters lPatent. i .Pgttl nt 9(l 1i),

tinuation desirably forms, with said. arm, f an angular lug whereby theshell may be mountedfsuch, continuation itself constituting an arm ofsuch lug. l

I will explain my invention more fully in {whichFigure l'illustratesasheet-of metalstanipedinto a syape that will permit it to be formedinto the shell of my invention; and Fig.2 is a longitudinal sectionalView of a shell formed from the sheet shown inFigl. w Like parts areindicated by similar characters of reference throughout the different,figures. y v y The shell 1 is made from a sheet of metal "2 shown in Figl. The shell has bcyonet slots 3', 4 which are stamped in the sheet,eachof the bayonet slots t-bei'ng partially formed two opposite paralleledge portions of the sheet as indicated at 4 theportions 4 matching,whenthe sheet is curled, to formthe bayonet slotst. In these same.opposite edges of the sheet 2. mortises 5' are formed, the mortises atone of these edge portions of the sheetbeing in difi erent zones fromthe mortises. inthe other edge portion I These mortises areso shaped asto leave; tenons alternatingtherewith,

each tenon having a n outenhead 6 and it stem 7 joining'thehea-d withthe body of the? sheet or shell, the narrow portion" of each mortisebeing outermost to receive a tenon stem while the largerportion of eachmortise is innermost to receive a tenon head The tenons at one edge .ofthe sheet are in different zones fromthe tenons at the other edge of thesheet. Each tenonis desirably in the shapeofia T tenon upon both sidesof .its stem. All of p I butI do not wish to be a limited to theprojection of thehea' d of each accompanying drawing T the mortises andtenons are of equal dimen- I I sions and the tenons uponeach of the'saidtwo edge portions of thesheetarereceived in the mortises in' the otherof such' edge portions of. the sheet when the sheet is properly curledto forin the shell. The in- 'teren a m lnner ed 'es 6 of the tenons areD C t) b 1 vent the shell from expanding and thevouter edges6 of thetenons, by engaging the base edges 5 of the'niortises, prevent the shellfrom contracting. The edges 6 the'outer edges'of the T-heads, and theinner edges of the mortises extend longitudinally of the allel with itsaxis. A eurled'shell having" joints thus'made'possesses advantages oversemloly of the, shell and core are contained V in my Patent 1,308,172,dated July 1,1919,

shell and are desirably substantiallyparone having dovetailedjointsemploying no well defined stems and heads and which have sides thatslope with respect tothe axisvof the shell, the new constructionpreventing the shell from contracting and expanding;

V The shell herein shown isof particular service in the structureforming the subject.

matter of the division of this application Serial No. 236,083, filed May23,1918 and, when thus employed, includes the formations 10, 14 and 15which form no particu lar part of the invention in the present case.

The claims relating to the improved aslVhile I have herein shown andparticularly described the preferred embodiment of my invention I donotwish to belimited the precisedetailsof construction shown as changesmay readily be made without de parting from the spirit otthe appendedclaims, but having thus described my invention I claim as new and desireto secure by Letters Patent the following l. A shell formed of a'curledsheethaving each of two opposite edge portions formed with alternatedsimilarly shaped equally dimensioned T-shaped mortises and tenons, themortlses in each edge portion re- 1 ceiving the tenons upon the otheredgeporti0n, tl1e longitudinal edges of the heads of the tenons andmortises being substantially parallel withthe axis of the shell.

l 2; A shell formed eta curled sheet havmg each of two opposite edgeportions "formed with alternated similarly shaped equally :dnnensioinedmortlses and V tenons, the mortises 1n each edge portionfreceiving the'tenons upon the other edge portion, said tenons lmving heads andstemsconnecting thefheads 'with the-balance of the shell,

while the niortises have narrower portions outermost that receive thestems of theftell' ens and larger portions 11111GTI1lOShthitt receirethe heads of the tenons the lon itudinal edges of the heads of thetenons and the mortises being substantially parallel with, the axis ofthe shell. T

3. A shell formed of a curled sheet hava ing each of two opposite edgeportions "formed withv alternated similarly shaped 7 portion,

connecting the heads with the'balance of equally dimensioned T- shapedmortises tenons, the mortises in'each edge portion reupon the otheroat-said edge portions to'prevent the shell from expanding.

5. A. shell formed'of a curledjsheet having each of two opposite edgeportions f formed with alternated mortises and tenons, the mortises ineach edge portion receiving the tenons upon the other edge said tenonshaving heads and stems the shell while the mortises have narrowerportions outermost that receive the stems of ceiving -the tenons upontheotheredge por- V the tenons and larger portions innermost I thatreceive the heads of the tenons, the longitudinal edges of the headsofthe'tenons 3 and the mortises being substantially parallel with theaxis oi the shell, the inner longitudlnal edges of the headsof thetenons upon each of saidfiedge portions being in" engagement with theinner longitudinal edges of the-heads of the tenons upon the ctherxofsaid edge ortions to prevent the shell from expanding. 6. A shell formedfacurled sheet having each 01": two opposite edge portions formed withalternated T-shaped mortises and tenons, the mortises in each edgeportion receiving the tenons upon the other edge portion, the innerlongitudinal edges of the heads of the tenons uponeach ofsaidedgeportions being in fengagementwith the inner longitudinal edges oftheheads' o fthe tenons upon the other of said edge portions to preventthe shelltfrom expanding.

0.1917. g r p I H RRY A. Bonerns.

I in witness whereof I hereunto subscribe my name this 25th dayiofSeptember, A. v

